src/sdl.cpp

   1 /* $Id: sdl.cpp 22406 2011-05-01 19:51:52Z rubidium $ */
   2
   3 /*
   4  * This file is part of OpenTTD.
   5  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
   6  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
   7  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
   8  */
   9
  10 /** @file sdl.cpp Implementation of SDL support. */
  11
  12 #include "stdafx.h"
  13
  14 #ifdef WITH_SDL
  15
  16 #include "sdl.h"
  17 #include <SDL.h>
  18
  19 /** Number of users of the SDL library. */
  20 static int _sdl_usage;
  21
  22 #ifdef DYNAMICALLY_LOADED_SDL
  23
  24 #include "os/windows/win32.h"
  25
  26 #define M(x) x "\0"
  27 static const char sdl_files[] =
  28         M("sdl.dll")
  29         M("SDL_Init")
  30         M("SDL_InitSubSystem")
  31         M("SDL_GetError")
  32         M("SDL_QuitSubSystem")
  33         M("SDL_UpdateRect")
  34         M("SDL_UpdateRects")
  35         M("SDL_SetColors")
  36         M("SDL_WM_SetCaption")
  37         M("SDL_ShowCursor")
  38         M("SDL_FreeSurface")
  39         M("SDL_PollEvent")
  40         M("SDL_WarpMouse")
  41         M("SDL_GetTicks")
  42         M("SDL_OpenAudio")
  43         M("SDL_PauseAudio")
  44         M("SDL_CloseAudio")
  45         M("SDL_LockSurface")
  46         M("SDL_UnlockSurface")
  47         M("SDL_GetModState")
  48         M("SDL_Delay")
  49         M("SDL_Quit")
  50         M("SDL_SetVideoMode")
  51         M("SDL_EnableKeyRepeat")
  52         M("SDL_EnableUNICODE")
  53         M("SDL_VideoDriverName")
  54         M("SDL_ListModes")
  55         M("SDL_GetKeyState")
  56         M("SDL_LoadBMP_RW")
  57         M("SDL_RWFromFile")
  58         M("SDL_SetColorKey")
  59         M("SDL_WM_SetIcon")
  60         M("SDL_MapRGB")
  61         M("SDL_VideoModeOK")
  62         M("SDL_Linked_Version")
  63         M("")
  64 ;
  65 #undef M
  66
  67 SDLProcs sdl_proc;
  68
  69 static const char *LoadSdlDLL()
  70 {
  71         if (sdl_proc.SDL_Init != nullptr) {
  72                 return nullptr;
  73         }
  74         if (!LoadLibraryList((Function *)(void *)&sdl_proc, sdl_files)) {
  75                 return "Unable to load sdl.dll";
  76         }
  77         return nullptr;
  78 }
  79
  80 #endif /* DYNAMICALLY_LOADED_SDL */
  81
  82 #include "safeguards.h"
  83
  84 /**
  85  * Open the SDL library.
  86  * @param x The subsystem to load.
  87  */
  88 const char *SdlOpen(uint32 x)
  89 {
  90 #ifdef DYNAMICALLY_LOADED_SDL
  91         {
  92                 const char *s = LoadSdlDLL();
  93                 if (s != nullptr) return s;
  94         }
  95 #endif
  96         if (_sdl_usage++ == 0) {
  97                 if (SDL_CALL SDL_Init(x | SDL_INIT_NOPARACHUTE) == -1) return SDL_CALL SDL_GetError();
  98         } else if (x != 0) {
  99                 if (SDL_CALL SDL_InitSubSystem(x) == -1) return SDL_CALL SDL_GetError();
 100         }
 101
 102         return nullptr;
 103 }
 104
 105 /**
 106  * Close the SDL library.
 107  * @param x The subsystem to close.
 108  */
 109 void SdlClose(uint32 x)
 110 {
 111         if (x != 0) {
 112                 SDL_CALL SDL_QuitSubSystem(x);
 113         }
 114         if (--_sdl_usage == 0) {
 115                 SDL_CALL SDL_Quit();
 116         }
 117 }
 118
 119 #endif